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Chemistry and Performance of Blended Cements and Backfills foruse in Radioactive Waste Disposal

Published online by Cambridge University Press:  03 September 2012

S. Duerden ,
F. P. Glasser ,
K. Goldthorpe ,
J. Pedersen ,
K. Quillin ,
D. Ross ,
S. A. Stronach  and
M. Tyrer
S. Duerden
Affiliation:
Environmental Agency, 2 Marsham Street, London, SW1P 3EB
F. P. Glasser
Affiliation:
Department of Chemistry, University of Aberdeen, Old Aberdeen, AB24 3UE, Scotland.
K. Goldthorpe
Affiliation:
Department of Chemistry, University of Aberdeen, Old Aberdeen, AB24 3UE, Scotland.
J. Pedersen
Affiliation:
Department of Chemistry, University of Aberdeen, Old Aberdeen, AB24 3UE, Scotland.
K. Quillin
Affiliation:
Building Research Establishment, Garston, Watford, WD2 7JR, England.
D. Ross
Affiliation:
W.S. Atkins, Epsom, Surrey, England.
S. A. Stronach
Affiliation:
Department of Chemistry, University of Aberdeen, Old Aberdeen, AB24 3UE, Scotland.
M. Tyrer
Affiliation:
Imperial College of Science, Technology and Medicine, London, SW7 2BP, England.
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Abstract

The ability of NaCl and MgSO4 to impair the performance ofPortland cement, blended cements containing slag and fly ash and of apermeable backfill have been measured. Performance is determined by decreasein pH, changes in mineralogy and loss of physical coherence. Experimentshave been made at 25°, 55° and 85°C and extensively backed up by chemicalmodels of cement performance. NaCl, up to 1.5M, has a comparatively slightimpact on performance but MgSO4 rapidly and almost quantitativelyreacts, lowering system pH's to < 10, conditioned by mixtures of Mg(OH)2 and magnesium silicates with gypsum.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 287
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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